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July 7, 2015

MADISON -- Heavy rains can create conditions that affect private wells and drinking water.

"If you live in an area that was recently or is currently flooded, your private well may be in danger of contamination from pollutants carried in floodwaters," said Liesa Lehmann, private water section chief with the Wisconsin Department of Natural Resources.

Well owners who observe flooding or changes in their water should assume their wells are contaminated and take the following steps:

Flood waters and runoff contain bacteria and other contaminants that can affect water supplies and cause water-borne illness. Wells located in pits, basements and low-lying areas are especially susceptible to contamination.

Even without obvious signs of flooding, a well can become contaminated. More recommendations for private well owners that have over-topped wells area available on the DNR website.

"Disinfection and sampling are best done by a licensed well driller or pump installer," Lehmann said. Any water supply system that has been submerged by flood waters should be pumped out once the floodwater recedes, then thoroughly disinfected and tested to determine that the water is safe.

Private well owners are encouraged to test their wells annually for bacteria and nitrates, to check for problems and ensure the water is safe to drink. More information on bacteriological contamination of drinking water wells, along with lists of licensed well drillers, pump installer and labs certified to analyze water samples are available by searching the DNR website,, for keyword wells.

For individuals who receive their drinking water from a public water supply, these systems are designed and operated to keep out contaminants. If you have concerns about the safety of your community's drinking water, contact your public water supplier.

FOR MORE INFORMATION CONTACT: Stacy Steinke, DNR private water specialist, 715-839-3773,; Marty Nessman, DNR private water field supervisor, 608-267-2449;; Jennifer Sereno, DNR communications, 608-770-8084,

Last Revised: Tuesday, July 07, 2015

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